- The Himalayan syntaxes, characterized by extreme rates of rock exhumation co-located with major trans-orogenic rivers, figure prominently in the debate on tectonic versus erosional forcing of exhumation. Both the mechanism and timing of rapid exhumation of the Namche Barwa massif in the eastern syntaxis remain controversial. It has been argued that coupling between crustal rock advection and surface erosion initiated in the late Miocene (8-10 Ma). Recent studies, in contrast, suggest a Quaternary onset of rapid exhumation linked to a purely tectonic mechanism. We report new multisystem detrital thermochronology data from the most proximal Neogene clastic sediments downstream of Namche Barwa and use a thermo-kinematic model constrained by new and published data to explore its exhumation history. Modeling results show that exhumation accelerated to similar to 4 km/m.y. at ca. 8 Ma and to similar to 9 km/m.y. after ca. 2 Ma. This three-stage history reconciles apparently contradictory evidence for early and late onset of rapid exhumationThe Himalayan syntaxes, characterized by extreme rates of rock exhumation co-located with major trans-orogenic rivers, figure prominently in the debate on tectonic versus erosional forcing of exhumation. Both the mechanism and timing of rapid exhumation of the Namche Barwa massif in the eastern syntaxis remain controversial. It has been argued that coupling between crustal rock advection and surface erosion initiated in the late Miocene (8-10 Ma). Recent studies, in contrast, suggest a Quaternary onset of rapid exhumation linked to a purely tectonic mechanism. We report new multisystem detrital thermochronology data from the most proximal Neogene clastic sediments downstream of Namche Barwa and use a thermo-kinematic model constrained by new and published data to explore its exhumation history. Modeling results show that exhumation accelerated to similar to 4 km/m.y. at ca. 8 Ma and to similar to 9 km/m.y. after ca. 2 Ma. This three-stage history reconciles apparently contradictory evidence for early and late onset of rapid exhumation and suggests efficient coupling between tectonics and erosion since the late Miocene. Quaternary acceleration of exhumation is consistent with river-profile evolution and may be linked to a Quaternary river-capture event.…
MetadatenAuthor details: | Gwladys Govin, Pieter A. van der BeekORCiDGND, Yani NajmanORCiD, Ian Millar, Lorenzo Gemignani, Pascale Huyghe, Guillaume Dupont-NivetORCiD, Matthias Bernet, Chris Mark, Jan Wijbrans |
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DOI: | https://doi.org/10.1130/G47720.1 |
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ISSN: | 0091-7613 |
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ISSN: | 1943-2682 |
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Title of parent work (English): | Geology |
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Publisher: | American Institute of Physics |
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Place of publishing: | Boulder |
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Publication type: | Article |
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Language: | English |
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Date of first publication: | 2020/07/21 |
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Publication year: | 2020 |
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Release date: | 2022/11/21 |
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Volume: | 48 |
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Issue: | 12 |
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Number of pages: | 5 |
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First page: | 1139 |
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Last Page: | 1143 |
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Funding institution: | European Union Research Executive Agency [316966]; UK Natural; Environment Research Council (NERC)UK Research & Innovation; (UKRI)Natural Environment Research Council (NERC) [IP-1500-1114]; Science Foundation IrelandScience Foundation IrelandEuropean Commission; [18/SIRG/5559]; NERCUK Research & Innovation (UKRI)Natural Environment; Research Council (NERC) [bgs06001] Funding Source: UKRI |
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Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Geowissenschaften |
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DDC classification: | 5 Naturwissenschaften und Mathematik / 55 Geowissenschaften, Geologie / 550 Geowissenschaften |
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Peer review: | Referiert |
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Publishing method: | Open Access / Hybrid Open-Access |
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License (German): | CC-BY - Namensnennung 4.0 International |
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